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Annals of Botany 62: 559-568, 1988
© 1988 Annals of Botany Company

RESEARCH-ARTICLE

Development and Floret Survival in Wheat Ears With Supernumerary Spikelets

G. P. KADKOL* and G. M. HALLORAN

Brumley Plant Sciences Centre, University Field Station, ‘Mt. Derrimut’, School of Agriculture and Forestry, The University of Melbourne Deer Park, Victoria, 3023, Australia

Accepted: 27 June 1988   

In the supernumerary spikelet wheat, AUS159I0, the supernumerary spikelet primordia appeared just after the ear reached the terminal spikelet stage. Appearance of the primordia of the multiple sessile spikelets preceded that of indeterminate rachilla spikelets. Supernumerary spikelets had a lower number of potentially fertile florets per spikelet than normal (non-supernumerary) spikelets in the ear and thus a smaller number of grains per spikelet. Mean weight per grain in the supernumerary spikelet wheat was lower than in the cultivar, Meering, without supernumerary spikelets. Total grain number in the supernumerary spikelet ear was greater than in the normal ear despite the lower spikelet fertility in the former. Within the supernumerary spikelet ear the multiple sessile spikelets had a higher number of grains per spikelet and mean weight per grain than the indeterminate rachilla spikelets. It appears possible to improve the productivity of the supernumerary spikelet ear by breeding for reduced expression of the indeterminate rachilla spikelets.

Wheat, ear development, floret survival, supernumerary spikelets, grain number


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